摘要
采用两类煤矸石替代碎石,利用工业固废基地聚物替代水泥,配置地聚物稳定煤矸石基层混合料.通过力学性能试验和收缩性能试验评价混合料路用性能,并利用XRD、TG-IR和SEM等微观试验对地聚物稳定煤矸石混合料强度机理进行分析.结果表明:含自燃矸石混合料路用性能良好,含水洗矸石混合料路用性能较差;地聚物胶凝材料与煤矸石发生固化反应生成了钙矾石、C-A-S-H凝胶、C-S-H凝胶等水化产物使得混合料形成强度;水洗矸石较高的膨胀土含量、有机质含量和较低的活性是导致两类煤矸石混合料强度差异显著的内在原因.
Abstract
Two types of coal gangue were used to replace crushed stones,and the industrial solid waste-based geopolymer was used to replaced the cement in formulating geopolymer-stabilized coal gangue base course mixture.The road performance of the mixture was evaluated through mechanical performance tests and shrinkage tests,and the strength mechanism of the geopolymer-stabilized coal gangue mixture was analyzed by using microscopic experiments including XRD,TG-IR,and SEM.The results indicated that the road performance of the mixture containing mined gangue was good,whereas the mixture containing water-washed gangue showed rel-atively poor road performance.The interaction between geopolymer cementitious materials and coal gangue resulted in the formation of ettringite,C-A-S-H gel,and C-S-H gel,enhancing the mixture's strength.The significant differences in strength between the two types of coal gangue mixtures were attributed to the higher expansive soil content,organic matter content,and lower activity of washed gangue.
维普
万方数据